threaded comments?

In Settings>Discussion, there’s an option for threaded discussion (which I’ve checked), but I don’t see a reply button on any comments. In searching for more information, I’ve seen some posts saying a plugin is needed, but then I read other information saying that with the latest versions of wpmu, no plugins are necessary.

I’m running wpmu 2.8.4, and BuddyPress 1.1. Does BuddyPress support threaded comments, or do I need to use a different theme?

I checked buddy theme 1.3 .It does not support threaded comment .btw,Try replacing the comments.php from buddytheme by comments.php from either default or home or bp-sn-parent.May be that should make it work,but you may need some css styling in that case.